无法使用 Google App Engine (GAE) 连接到 Google Cloud Messaging (GCM) 服务器

Question

我正在尝试为我的应用设置 Google 云消息传递，并且我正在为我的服务器使用 Google App Engine。我有我的 API 密钥，但我似乎无法连接到谷歌云消息服务器。这是我的代码。

HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("https://android.googleapis.com/gcm/send");
        try {

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("registration_id", regId));
            nameValuePairs.add(new BasicNameValuePair("data.message", messageText));    

            post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            post.setHeader("Authorization", "key=*MY_API_KEY_HERE*");
            post.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");


            Header[] s=post.getAllHeaders();


            System.out.println("The header from the httpclient:");

            for(int i=0; i < s.length; i++){
            Header hd = s[i];

            System.out.println("Header Name: "+hd.getName()
                    +"       "+" Header Value: "+ hd.getValue());
            }


            HttpResponse response = client.execute(post);
            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            String line = "";
            while ((line = rd.readLine()) != null) {
            System.out.println(line);
            }

            } catch (IOException e) {
                e.printStackTrace();
        }

当我查看日志时，标题设置正确。但是，我收到一个错误提示

org.apache.http.impl.client.DefaultRequestDirector tryConnect：连接到目标主机时捕获 I/O 异常 (java.net.SocketException)：权限被拒绝：尝试在未经许可的情况下访问被阻止的收件人。 (映射-IPv4)

我已经在 Google API 控制台中打开了 Google 云消息传递，并且我已经检查了很多次我的 API 密钥。我不知道为什么我会被拒绝。是否有我在战争中需要的罐子或我必须在清单中放入的东西？

感谢您阅读本文！ 标记

Answer 1

我遇到了同样的问题，我正在使用与您正在使用的类似的东西。

1. 我必须在我的 GAE 应用程序上启用计费功能（您可能有，但我不知道我必须这样做）
2. 阅读 https://developers.google.com/appengine/docs/java/sockets/ 和 https://developers.google.com/appengine/docs/java/urlfetch/

因此，我之前看起来像你的代码现在看起来如下：

String json ="{}"; 
URL url = new URL("https://android.googleapis.com/gcm/send");
HTTPRequest request = new HTTPRequest(url, HTTPMethod.POST);
request.addHeader(new HTTPHeader("Content-Type","application/json")); 
request.addHeader(new HTTPHeader("Authorization", "key=<>"));
request.setPayload(json.getBytes("UTF-8"));
HTTPResponse response = URLFetchServiceFactory.getURLFetchService().fetch(request);

Answer 2

我也在用 GAE 实现 GCM，我遇到了这样的错误：

com.google.apphosting.api.ApiProxy$FeatureNotEnabledException: The Socket API will be enabled for this application once billing has been enabled in the admin console.

Nikunj 的回答也帮助了我。在实施他的建议后，通知会发送到设备，而无需为我的 GAE 应用程序启用计费。 这是我的实现，以防万一，可能对有同样问题的人有用：

private void sendNotificationRequestToGcm(List<String> registrationIds) {
    LOG.info("In sendNotificationRequestToGcm method!");
    JSONObject json = new JSONObject();
    JSONArray jasonArray = new JSONArray(registrationIds);
    try {
        json.put("registration_ids", jasonArray);
    } catch (JSONException e2) {
        LOG.severe("JSONException: " + e2.getMessage());
    }
    String jsonString = json.toString();
    LOG.info("JSON payload: " + jsonString);

    com.google.appengine.api.urlfetch.HTTPResponse response;
    URL url;
    HTTPRequest httpRequest;
    try {
        //GCM_URL = https://android.googleapis.com/gcm/send
        url = new URL(GCM_URL);
        httpRequest = new HTTPRequest(url, HTTPMethod.POST);
        httpRequest.addHeader(new HTTPHeader("Content-Type","application/json"));
        httpRequest.addHeader(new HTTPHeader("Authorization", "key=" + API_KEY));
        httpRequest.setPayload(jsonString.getBytes("UTF-8"));
        LOG.info("Sending POST request to: " + GCM_URL);
        response = URLFetchServiceFactory.getURLFetchService().fetch(httpRequest);
        LOG.info("Status: " + response.getResponseCode());            
        List<HTTPHeader> hdrs = response.getHeaders();
        for(HTTPHeader header : hdrs) {
            LOG.info("Header: " + header.getName());
            LOG.info("Value:  " + header.getValue());
        }            
    } catch (UnsupportedEncodingException e1) {
        LOG.severe("UnsupportedEncodingException" + e1.getMessage());
    } catch (MalformedURLException e1) {
        LOG.severe("MalformedURLException" + e1.getMessage());
    } catch (IOException e) {
        LOG.severe("URLFETCH IOException" + e.getMessage());
    }
}

希望这会对某人有所帮助...

Answer 3

最简单的方法是使用gcm-server.jar（您可以从here 获得）。

那么您需要发送 GCM 消息的代码将如下所示：

Sender sender = new Sender(apiKey);
Message message = new Message.Builder()
    .addData("message", "this is the message")
    .addData("other-parameter", "some value")
    .build();
Result result = sender.send(message, registrationId, numOfRetries);

这是 gradle 依赖： compile 'com.google.gcm:gcm-server:1.0.0' 和mvnrepository url

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